| 摘要 |
<p>An electrophotographic printing machine is provided with a photoreceptor (1) whereon a transparent electrically conductive layer (1b) and a photoconductive layer (1C) are successively formed. A visible image is formed on the photoconductive layer (1c) by exposing the photoconductive layer while applying a voltage across toner (T) supplied onto the surface of the photoreceptor (1) and the transparent electrically conductive layer (1c). The exposing energy of the exposure unit is set so as to satisfy an equation: VL >/= VD - VD1, where VD1 designates the surface electric potential of the photoreceptor (1) that is exerted when the surface of the photoreceptor (1), originally having a surface electric potential of virtually zero V, passes by the area in contact with the toner; VD designates the saturation value of the surface electric potential of the photoreceptor (1) that is attained after the surface of the photoreceptor (1) has successively passed by the area in contact with the toner; and VL designates a lowered surface electric potential of the photoreceptor that is to be reached by an exposure. Therefore, good picture images without being affected by residual images can be obtained. <IMAGE></p> |
